The TANDEMKROSS HALO Charging Ring in silver finish is specifically designed for Ruger Mark III and Mark IV pistols to enhance charging handle operation and functionality.TANDEMKROSS HALO Charging Ring - Model TK24N0164SLV1Silver anodized finish for durability and aestheticsCompatible with Ruger Mark III and Mark IV pistolsPrecision machined constructionUPC: 769498483794This aftermarket accessory improves the ergonomics and reliability of your Ruger pistol's charging mechanism making it ideal for competitive shooting training or recreational use.